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A phenomenon which occurs when light seen coming from an object that is moving away from the observer is proportionally increased in wavelength or "shifted" to the red end of the visible light spectrum. refraction The change in direction of a wave as it passes from one transmission medium to another or as a result of a gradual change in the medium.
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
Meaning: a prefix used to make words with a sense opposite to that of the root word; in this case, meaning "without" or "-less". This is usually used to describe organisms without a certain characteristic, as well as organisms in which that characteristic may not be immediately obvious.
The plane of the ecliptic (grey) is defined by the Earth's orbit around the Sun, and is distinct from the plane of the celestial sphere 's equator (green), which is permanently tilted 23.4 degrees with respect to the ecliptic. To an observer on Earth, this means that the path the Sun appears to follow upon the celestial sphere is not a straight ...
X-ray motion analysis is a technique used to track the movement of objects using X-rays. This is done by placing the subject to be imaged in the center of the X-ray beam and recording the motion using an image intensifier and a high-speed camera , allowing for high quality videos sampled many times per second.
2. Xeme. Also known as Sabine's Gull, these animals are graceful seabirds that live in a variety of habitats depending on the season. In the summer, they can be found across the Arctic and ...
Every year on Feb. 2, Punxsutawney Phil the groundhog tries to predict the end of winter.. As tradition goes, if Phil sees his shadow, the U.s. has six more weeks of winter. If he doesn't see his ...
cattalo, from cattle and buffalo [2]; donkra, from donkey and zebra (progeny of donkey stallion and zebra mare) cf. zedonk below; llamanaco, from llama and guanaco [3]; wholphin, from whale and dolphin [2]